PLANT GALLS FROM SELBY AND YORK. 
129 
WILLIAM FALCONER, F.E.S. 
The list given below contains the names of the plant galls 
noticed on August 1st and 2nd of last year on the occasion of 
the Union Meeting at York. The writer, detraining at 
Selby, proceeded up the left bank of the Ouse, along the 
Bubwith road, and across the Common to Skipwith, and 
spent the next day alone on Askham Bog. Unfortunately a 
thunder-storm, accompanied by torrential rain, brought the 
search in the latter place to a premature end, just when it 
seemed most profitable. The long undisturbed condition, 
and the great wealth and variety of the vegetation along the 
routes traversed, greatly favoured the presence and productions 
of the various gall agents, and some very noteworthy species 
were met with. Amongst them may be cited Lipara lucens 
Mgn., new to the north of England ; four dipterous galls 
on sedges, new to Yorkshire ; the unnamed mite galls in 
Houard/s Zoocecidies, S. 53 and S. 59 ; Xestophanes potentillae 
Retz., Perrisia populeti Rubs, Rhopalomyia tanaceticola Krsk. ; 
and a Psyllid on Galium cruciata. 
Hymenoptera. 
Pontania proximo, Lepel. The common leaf ‘bean’ gall, plentiful 
throughout on Salix alba, cinerea, fragilis, and caprea. 
P. salicis Christ. On 5 . repens, Skipwith Common. Mr. F. A. Mason 
also brought in specimens. 
P. viminalis Htg. On S. cinerea, on the Bubwith Road. 
Cryptocdmpus saliceti Fall. On 5 . cinerea, Bubwith Road. 
C. ater Jur. On S. caprea, Askham Bog. 
The following on oak on Skipwith Common : — 
(1) early stages of Neuroterus lenticularis Oliv., N. laeviusculus 
Schr., N. numismatis Oliv., Andricus ostreus Gir., and 
Dryophanta divisa Htg. 
(2) mature and emerging, D. agama Htg. 
(3) new, Cynips kollari Htg. 
(4) old remains, N. baccarum Linn. 
Xestophanes potentillae Retz. On creeping cinquefoil, on the river bank 
close to Selby. 
Rhodites rosae Linn. On wild rose, many examples by roadside, en route 
to Askham Bog. 
Diptera. 
Lipara lucens Mgn. On Phragmites communis , several specimens in one 
particular spot in Askham Bog ; probably in other parts of the 
bog where the dwarfed plants are more concealed. It is a local 
species anywhere, and has not hitherto been noted in the N. of 
England 
Mayetiola ventricola Rubs. On Molinia, Skipwith Common and Askham 
Bog, plentiful. 
Dichrona gall arum Rubs., Pseudhormomyia granijex KiefL, Hormomyia 
hneucheri KiefL, Houard No. 377 ; Dishormomyia cornifex KiefL, 
all at the base of sedge stems, most of the plants past fruiting 
and unrecognisable specifically, except C. hirta Linn., and C. 
goodenovii Gay ; Askham Bog. The flies of the second emerged 
within a fortnight. 
1922 Apl, 1 
I 
